Method and apparatus for controlling an hydraulic cylinder

Details Method and apparatus for controlling an hydraulic cylinder Method and apparatus for controlling an hydraulic cylinder

G - Physics

04

G

342/19, 138/78

G04G 15/00 (2006.01) F15B 21/02 (2006.01)

Patent

CA 1067606

Method and Apparatus for Controlling an Hydraulic Cylinder Abstract Automated control apparatus for an intermittently extended hydraulic cylinder is disclosed which governs cylinder elongation such that the rate of elongation is essentially constant with respect to time. The control apparatus includes a preset continuously variable timer that regulates the timer interval between sequential length increments of the cylinder. The control apparatus also includes a second timer which is responsive to the timer interval interposed by the first timer and which operates a valve controlling communication of hydraulic fluid between a hydraulic cylinder and a pump. The second timer may be discretely variable so that one of a plurality of predetermined length increments can be selected. Alternatively, the second timer may adjust the time period during which the valve is opened such that successive stages of a telescopic hydraulic cylinder have equal length increments.

268065

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